
1) Amplification tube 2) Amplifier component 3) Certain electron tube 4) Certain tube 5) Certain vacuum tube 6) Early radio component 7) Electron tube 8) Guitar amp part 9) Guitar-amplifier tube 10) Invention of 1906 11) Lee De Forest invention 12) Old computer tube 13) Old radio tube 14) Old tv part
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https://www.crosswordclues.com/clue/triode

A thermionic emission tube with three electrodes
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cathode, anode, and grid.

A triode is an electronic amplifying vacuum tube (or valve in British English) consisting of three electrodes inside an evacuated glass envelope: a heated filament or cathode, a grid, and a plate (anode). Invented in 1906 by Lee De Forest by adding a grid to the Fleming valve, the triode was the first electronic amplification device and the ancest...
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http://en.wikipedia.org/wiki/Triode

A thermionic valve with anode, cathode and control grid.
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http://jot101.com/2015/05/a-z-of-science-fiction-words/

electron tube consisting of three electrodescathode filament, anode plate, and control gridmounted in an evacuated metal or glass container. It has ... [3 related articles]
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http://www.britannica.com/eb/a-z/t/81

a three-electrode electronic tube containing an anode, a cathode, and a control electrode, usually a grid
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=531-31-02

A triode is an electronic amplifying valve with three main electrodes (anode, cathode and grid).
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http://www.probertencyclopaedia.com/browse/GT.HTM

[
n] - a thermionic vacuum tube having three electrodes
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http://www.webdictionary.co.uk/definition.php?query=triode

A triode is an electronic amplifying valve with three main electrodes (anode, cathode and grid). See also: Valve.
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https://www.encyclo.co.uk/local/20687

A multi-grid radio valve (or tube) with three electrodes (an anode, cathode, and a control grid), commonly used in audio and radio amplifiers, and oscillator circuits.
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https://www.encyclo.co.uk/local/20820
noun a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which making amplification possible
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https://www.encyclo.co.uk/local/20974
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